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Terahertz generation with tandem seeded optical parametric generators.

P E Powers1, R A Alkuwari, J W Haus

  • 1Department of Physics and the Electro-Optics Program, University of Dayton, Dayton, Ohio 45469-2314, USA. peter.powers@notes.udayton.edu

Optics Letters
|March 29, 2005
PubMed
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A novel tunable terahertz (THz) source was developed using difference frequency generation (DFG). This system, employing a DAST crystal, offers seamless tuning from 1.6 to 4.5 THz, demonstrating its utility for high-resolution spectroscopy.

Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Terahertz Science

Background:

  • Terahertz (THz) radiation is crucial for various spectroscopic applications.
  • Developing tunable and efficient THz sources remains a significant challenge.
  • Optical parametric generators (OPGs) offer a versatile platform for THz generation.

Purpose of the Study:

  • To present a simple and tunable THz source based on difference frequency generation (DFG).
  • To demonstrate continuous tuning of the THz source over a broad spectral range.
  • To showcase the source's capability for high-resolution spectroscopy.

Main Methods:

  • Utilizing a DFG scheme with two seeded optical parametric generators.
  • Employing the nonlinear optical crystal 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) as the DFG crystal.

Related Experiment Videos

  • Achieving continuous and seamless tunable operation from 1.6 to 4.5 THz.

    • Main Results:

    • Demonstrated a tunable THz source with seamless operation from 1.6 to 4.5 THz.
    • The THz source exhibits an output bandwidth of 2.4 GHz.
    • Successfully measured a high-resolution transmission spectrum of water vapor in air.

    Conclusions:

    • The presented DFG scheme provides a simple and effective tunable THz source.
    • The DAST crystal enables broad spectral coverage and continuous tuning.
    • The THz source is suitable for high-resolution spectroscopic measurements of gases.